Manufacturing method of three-dimensional structure and three-dimensional structure

ABSTRACT

Provided is a manufacturing method of a three-dimensional structure which manufactures a three-dimensional structure by laminating layers, the method including: forming the layers using a three-dimensional formation composition containing three-dimensional formation powders, a solvent, and a binder; discharging a binding solution containing a binding agent to the layers; and performing a permeation prevention step of preventing the solvent from permeating the layers, at least on a part of the layers to which the binding solution is discharged. It is preferable that the permeation prevention process is selectively performed with respect to an area of the layers to which the binding solution is not discharged.

BACKGROUND

1. Technical Field

The present invention relates to a manufacturing method of a three-dimensional structure and a three-dimensional structure.

2. Related Art

A manufacturing method of a three-dimensional structure which forms a three-dimensional object by solidifying powders with a binding solution has been known (for example, see JP-A-2001-150556). With this manufacturing apparatus, a three-dimensional object is formed by repeating the following operations. First, the powders are spread thin by a blade to form a powder layer, and the binding solution is discharged to a desired portion of the powder layer, and accordingly the powders are bound to each other. As a result, among the powder layer, the part having the binding solution discharged thereto is only bound, and a thin plate-shaped member (hereinafter, referred to as a “unit layer”) is formed. After that, a powder layer is further formed thin on the above powder layer and the binding solution is discharged to the desired part. As a result, a new unit layer is also formed on a part of the newly formed powder layer newly formed, having the binding solution discharged thereto. At that time, since the binding solution discharged permeates the powder layer and reaches the unit layer previously formed, the newly formed unit layer is also bound with the previously formed unit layer. Such operations are repeated to laminate the thin plate-shaped unit layers one by one, and accordingly, a three-dimensional object can be formed.

With such a three-dimensional formation technology, it is possible to bind the powders to immediately form the structure, as long as three-dimensional shape data of an object to be formed is provided, and since it is not necessary to manufacture a mold prior to the formation, it is possible to form a three-dimensional object in a short period of time at a low cost. In addition, since the structure is formed by laminating the thin plate-shaped unit layers one by one, it is even possible to form a complicated object having an internal structure, for example, an integrated structure without dividing the structure into a plurality of components.

However, in the manufacturing method of a three-dimensional structure of the related art, since the binding solution is discharged to the powder layer configured with powder, some powders are scattered by the binding solution landed thereupon.

In order to prevent such scattering of the powder, there has been an attempt to use a paste material containing the powders and a liquid component (for example, see JP-A-2011-245712).

However, in the manufacturing method using a paste material containing a liquid component, the liquid component (solvent) of an upper layer permeates a lower layer when forming the layers, and accordingly uniform layer formation may be disturbed.

SUMMARY

An advantage of some aspects of the invention is to provide a manufacturing method of a three-dimensional structure which can manufacture a three-dimensional structure with high dimensional accuracy and a three-dimensional structure which is manufactured with high dimensional accuracy.

The invention is realized in the following forms.

According to an aspect of the invention, there is provided a manufacturing method of a three-dimensional structure which manufactures a three-dimensional structure by laminating layers, the method including: forming the layers using a three-dimensional formation composition containing three-dimensional formation powders, a solvent, and a binder; discharging a binding solution containing a binding agent to the layers; and performing a permeation prevention step of preventing the solvent from permeating the layers, at least on a part of the layers to which the binding solution is discharged.

In this case, it is possible to manufacture a three-dimensional structure with high dimensional accuracy.

In the manufacturing method of a three-dimensional structure according to the aspect of the invention, it is preferable that the permeation prevention process is selectively performed with respect to an area of the layers to which the binding solution is not discharged.

In this case, it is possible to more efficiently perform the permeation prevention process.

In the manufacturing method of a three-dimensional structure according to the aspect of the invention, it is preferable that the permeation prevention process is performed by applying a permeation prevention agent containing the binder.

In this case, it is possible to more easily perform the permeation prevention process.

In the manufacturing method of a three-dimensional structure according to the aspect of the invention, it is preferable that the application of the permeation prevention agent is performed by any one of a group consisting of an ink jet method, a squeegee method, a transfer method, or a sublimation method.

In this case, it is possible to more easily perform the permeation prevention process.

In the manufacturing method of a three-dimensional structure according to the aspect of the invention, it is preferable that the solvent is water-soluble.

In this case, it is possible to more easily form layers having a uniform thickness.

According to an aspect of the invention, there is provided a three-dimensional structure which is manufactured by the manufacturing method of a three-dimensional structure according to the aspects of the invention.

In this case, it is possible to provide a three-dimensional structure manufactured with high dimensional accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIGS. 1A to 1D are schematic views showing each step of a preferred embodiment of a manufacturing method of a three-dimensional structure of the invention.

FIGS. 2A to 2D are schematic views showing each step of a preferred embodiment of a manufacturing method of a three-dimensional structure of the invention.

FIG. 3 is a cross-sectional view schematically showing a state inside of a layer (three-dimensional formation compositions) immediately before a discharging step.

FIG. 4 is a cross-sectional view schematically showing a state where particles are bound by binding agents.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

1. Manufacturing Method of Three-Dimensional Structure

First, a manufacturing method of the three-dimensional structure will be described in detail.

FIGS. 1A to 2D are schematic views showing each step of a preferred embodiment of the manufacturing method of the three-dimensional structure of the invention, FIG. 3 is a cross-sectional view schematically showing a state inside of the layer (three-dimensional formation compositions) immediately before a discharging step, and FIG. 4 is a cross-sectional view schematically showing a state where particles are bound by the binding agents.

As shown in FIGS. 1A to 2D, the manufacturing method of the three-dimensional structure of the embodiment includes a layer formation step (FIGS. 1A and 1D) of forming a layer 6 using a three-dimensional formation composition containing three-dimensional formation powders configured with a plurality of particles, a solvent, and a binder, a discharge step (FIGS. 1B and 2A) of applying a binding solution 4 containing a binding agent 44 to the layer 6 by an ink jet method, a permeation prevention step (FIGS. 1B and 2A) of performing a permeation prevention process for preventing the permeation of the solvent, and a curing step (FIGS. 1C and 2B) of curing the binding agent 44 contained in a binding solution 4 applied to the layer 6 and forming a unit layer 7. The above steps are repeatedly performed in this order, and after that, a non-bound particles removing step (FIG. 2D) of removing particles not bound by the binding agent 44, among particles 63 configuring each layer 6, is performed.

Layer Formation Step

First, the layer 6 is formed on a formation stage 80, using the three-dimensional formation composition containing the three-dimensional formation powders, the solvent, and the binder (FIG. 1A).

As will be described later, the three-dimensional formation composition contains the plurality of particles 63 and a binder 64, as described below. By containing the binder 64, it is possible to bind (temporarily fix) the particles 63 to each other (see FIG. 3) and to effectively prevent unexpected scattering of the particles. Therefore, it is possible to ensure the safety of an operator and improve the dimensional accuracy of the three-dimensional structure 1 to be manufactured.

This step can be performed, for example, by using a method such as a squeegee method, a screen printing method, a doctor blade method, a spin coating method, or the like.

The thickness of the layer 6 formed in this step is not particularly limited, but is preferably from 30 μm to 500 μm and more preferably from 70 μm to 150 μm. Therefore, it is possible to realize a sufficiently excellent productivity of the three-dimensional structure 1, to more effectively prevent generation of unexpected irregularities on the three-dimensional structure 1 to be manufactured, and to realize particularly excellent dimensional accuracy of the three-dimensional structure 1.

Discharge Step

Next, the binding solution 4 containing the binding agent 44 is discharged to the layer 6 by the ink jet method (FIG. 1B).

In this step, the binding solution is selectively only applied to a portion corresponding to the actual portion (portion having the actual body) of the three-dimensional structure 1 among the layer 6.

Accordingly, it is possible to rigidly bind the particles 63 configuring the layer 6 to each other by the binding agent 44, and to realize excellent mechanical strength of the three-dimensional structure 1 to be finally acquired. In a case where the three-dimensional formation composition configuring the layer 6 contains the plurality of porous particles 63, the binding agent 44 is introduced into holes 611 of the particles 63, and an anchor effect is exhibited. As a result, it is possible to realize excellent binding power (binding power through the binding agent 44) for the binding of the particles 63 and to realize excellent mechanical strength of the three-dimensional structure 1 to be finally acquired (see FIG. 4). Since the binding agent 44 configuring the binding solution 4 applied in this step is introduced into the holes 611 of the particles 63, it is possible to effectively prevent unexpected wet spreading of the binding solution. As a result, it is possible to have higher dimensional accuracy of the three-dimensional structure 1 to be finally acquired.

In this step, since the binding solution 4 is applied by the ink jet method, it is possible to apply the binding solution 4 with excellent reproducibility, even when an application pattern of the binding solution 4 is a fine shape. As a result, it is possible to have particularly high dimensional accuracy of the three-dimensional structure 1 to be finally acquired, with an effect obtained by the introduction of the binding agent 44 into the holes 611 of the particles 63.

In this step, the binding solution 4 containing a colorant for coloring is discharged to the layer 6 corresponding to the outer edge side of the three-dimensional structure 1.

In this step, the layer 6 corresponding to the vicinity of the outer edge of the three-dimensional structure 1 is divided into a plurality of discharge unit areas to which the binding solution 4 is discharged, and the binding solution 4 is applied to the discharge unit area.

Permeation Prevention Step

In this step, the permeation prevention step of preventing the solvent contained in the layer 6 formed on an upper portion from permeating the previously formed layer 6, is performed. That is, when the n-th layer 6 is formed, a process of preventing the solvent in the three-dimensional formation composition for forming the n+1-th layer 6 from permeating the n-th layer 6, is performed on the surface of the n-th layer 6. Accordingly, it is possible to stably form the layer 6 without losing the fluidity of the three-dimensional formation composition.

In the embodiment, a permeation prevention agent 5 is applied by an ink jet method simultaneously with the application of the binding solution 4 (FIGS. 1B and 2A).

In the embodiment, the permeation prevention agent 5 is selectively applied to an area to which the binding solution 4 is not applied. Accordingly, it is possible to more efficiently perform the permeation prevention process.

Examples of the permeation prevention agent 5 include a solution containing the binder contained in the three-dimensional formation composition, a resin emulsion such as an acrylic resin emulsion, an acrylic silicone resin emulsion, or a vinyl acetate emulsion, a water-soluble solvent such as glycerin, polyethylene glycol, polypropylene glycol, ethylene glycol, or diethylene glycol. Among these, when the solution containing the binder is used, it is possible to more easily perform the permeation prevention process. In addition, it is also possible to easily reuse the three-dimensional formation composition.

In the embodiment, the application of the permeation prevention agent 5 has been described so as to be performed using an ink jet method, but a squeegee method, a transfer method, or a sublimation method may be used. Accordingly, it is possible to easily perform the permeation prevention process.

In the embodiment, the permeation prevention agent 5 has been selectively applied to an area to which the binding solution 4 is not applied, but the permeation prevention agent 5 may be applied to an area to which the binding solution 4 is applied.

In the embodiment, the permeation prevention process is performed on the surface of the layer 6, by ejecting amount of a permeation prevention agent 5 is smaller than that of a binding solution 4 per unit area of the layer 6 face. But, there is no limitation, and the permeation prevention process may be also performed in the layer 6.

Curing Step

Then, the binding agent 44 applied to the layer 6 is cured and the unit layer (cured portion) 7 is formed (FIG. 1C). Accordingly, it is possible to realize particularly excellent binding strength between the binding agent 44 and the particles 63, and as a result, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1 to be finally acquired.

A volume contraction rate of the discharge unit area which is formed as the unit layer 7 is preferably constant, regardless of color. Accordingly, it is possible to prevent occurrence of irregularities due to a difference in a contraction rate on the surface of the three-dimensional structure 1. As a result, it is possible to perform clear color reproduction on the surface of the three-dimensional structure. The constant volume contraction rate means a difference in the constant volume contraction rate with a range of ±5%.

This step is performed differently depending on the types of the binding agent 44. For example, when the binding agent 44 is a thermosetting component, it is possible to perform the step by heating, and when the binding agent 44 is a photo-curable component, it is possible to perform the step by irradiation of the corresponding light (for example, when the binding agent 44 is an ultraviolet curable component, it is possible to perform the step by irradiation of an ultraviolet ray).

The discharge step and the curing step may be simultaneously performed. That is, the curing reaction may proceed sequentially from the portion to which the binding solution 4 is applied, before the entire pattern of one entire layer 6 is formed.

After that, a sequence of the above steps is repeatedly performed (see FIGS. 1D, 2A, and 2B). Accordingly, among each layer 6, the particles 63 in the portion having the binding solution 4 applied thereto, are bound to each other, and the three-dimensional structure 1 as a laminate obtained by laminating the plurality of layers 6 in such a state is obtained (see FIG. 2C).

The binding solution 4 applied to the layer 6 in the second or subsequent discharge steps (see FIG. 1D) is used for the binding of the particles 63 configuring the layer 6, and a part of the binding solution 4 applied permeates a layer 6 lower than the above layer 6. Accordingly, the binding solution 4 is not only used for the binding of the particles 63 in each layer 6, but is also used for the binding of the particles 63 between the adjacent layers. As a result, the three-dimensional structure 1 to be finally acquired has excellent mechanical strength over the entire structure.

Non-Bound Particles Removing Step

After repeatedly performing a series of the above steps, a not-bound particles removing step (FIG. 2D) of removing the non-bound particles by the binding agent 44 among the particles 63 configuring each layer 6, is performed as a post-treatment step. Accordingly, the three-dimensional structure 1 is produced.

Specific examples of the method of this step include a method of brushing away the non-bound particles with a brush, a method of removing the non-bound particles by absorption, a method of blowing gas such as air, a method of applying liquid such as water (for example, a method of immersing a laminate obtained as described above in the liquid, or a method of blowing the liquid), or a method of applying vibration such as ultrasonic vibration. A combination of two or more methods selected from these can be used. More specifically, a method of immersing in the liquid such as water after blowing the gas such as air or a method of applying ultrasonic vibration in a state of being immersed in liquid such as water is used. Among these, it is preferable to use a method of applying liquid containing water to the laminate obtained as described above (particularly, a method of immersing in liquid containing water). Accordingly, the particles not bound by the binding agent 44 among the particles 63 configuring each layer 6 are temporarily fixed by the binder 64, but the binder 64 is dissolved by using the liquid containing water, and the temporary fixation described above is released, and accordingly, it is possible to more easily and more reliably remove the particles from the three-dimensional structure 1. In addition, it is possible to more reliably prevent generation of defects such as scratches on the three-dimensional structure 1 when removing the non-bound particles. Further, it is possible to perform the washing of the three-dimensional structure 1 by employing such a method.

The dimensional accuracy of the three-dimensional structure manufactured by the manufacturing method described above is increased.

2. Three-Dimensional Formation Composition

Next, the three-dimensional formation composition will be described in detail.

The three-dimensional formation composition contains the three-dimensional formation powders, the binder 64, and the solvent.

Hereinafter, each component will be described in detail.

Three-Dimensional Formation Powders

The three-dimensional formation powders are configured with the plurality of particles 63.

Any particles can be used as the particles 63, but the particles are preferably configured with porous particles. Accordingly, it is possible to preferably make the binding agent 44 permeate the inside of the holes, when manufacturing the three-dimensional structure 1, and therefore, it is possible to preferably use the particles in manufacturing the three-dimensional structure having excellent mechanical strength.

As a constituent material of the porous particles configuring the three-dimensional formation particles, an inorganic material or an organic material, or a complex of these is used, for example.

Examples of the inorganic material configuring the porous particles include various metals or metal compounds. Examples of the metal compounds include various metal oxides such as silica, alumina, titanium oxide, zinc oxide, zirconium oxide, tin oxide, magnesium oxide, and potassium titanate; various metal hydroxides such as magnesium hydroxide, aluminum hydroxide, and calcium hydroxide; various metal nitrides such as silicon nitride, titanium nitride, and aluminum nitride; various metal carbide such as silicon carbide and titanium carbide; various metal sulfide such as zinc sulfide; various metal carbonates such as calcium carbonate and magnesium carbonate; various metal sulfates such as calcium sulfate and magnesium sulfate; various metal silicates such as calcium silicate and magnesium silicate; various metal phosphates such as calcium phosphate; various metal borates such as aluminum borate and magnesium borate; and a composite compound thereof.

Examples of the organic material configuring the porous particles include a synthetic resin and a natural polymer, and specific examples thereof include a polyethylene resin; polypropylene; polyethylene oxide; polypropylene oxide; polyethylene imine; polystyrene; polyurethane; polyurea; polyester; a silicone resin; an acrylic silicone resin; a polymer having ester(meth)acrylate such as methyl polymethacrylate as a constituent monomer; a crosspolymer having (meth)acrylate such as a methyl methacrylate crosspolymer as a constituent monomer (such as an ethylene-acrylic acid copolymer resin); a polyamide resin such as nylon 12, nylon 6, or copolymer nylon; polyimide; carboxymethyl cellulose; gelatin; starch; chitin; and chitosan.

Among these, the porous particles are preferably configured with the organic material, and more preferably configured with metal oxide, and even more preferably configured with silica. Therefore, it is possible to realize particularly excellent properties such as mechanical strength and light resistance of the three-dimensional structure. Particularly, when the porous particles are configured with silica, the effects described above are more significantly exhibited. Since silica has also excellent fluidity, it is advantageous in forming the layer having higher uniformity in thickness and it is possible to realize particularly excellent productivity and dimensional accuracy of the three-dimensional structure 1.

As silica, a product commercially available in a market can be preferably used. Specific examples thereof include MIZKASIL P-526, MIZKASIL P-801, MIZKASIL NP-8, MIZKASIL P-802, MIZKASIL P-802Y, MIZKASIL C-212, MIZKASIL P-73, MIZKASIL P-78A, MIZKASIL P-78F, MIZKASIL P-87, MIZKASIL P-705, MIZKASIL P-707, MIZKASIL P-707D, MIZKASIL P-709, MIZKASIL C-402, MIZKASIL C-484 (all manufactured by Mizusawa Industrial Chemicals, Ltd.), TOKUSIL U, TOKUSIL UR, TOKUSIL GU, TOKUSIL AL-1, TOKUSIL GU-N, TOKUSIL N, TOKUSIL NR, TOKUSIL PR, SOLEX, FINESIL E-50, FINESIL T-32, FINESIL X-30, FINESIL X-37, FINESIL X-37B, FINESIL X-45, FINESIL X-60, FINESIL X-70, FINESIL RX-70, FINESIL A, FINESIL B (all manufactured by Tokuyama Corporation), SIPERNAT, CARPLEX FPS-101, CARPLEX CS-7, CARPLEX 22S, CARPLEX 80, CARPLEX 80D, CARPLEX XR, CARPLEX 67 (all manufactured by DSL JAPAN Co., Ltd.), SYLOID 63, SYLOID 65, SYLOID 66, SYLOID 77, SYLOID 74, SYLOID 79, SYLOID 404, SYLOID 620, SYLOID 800, SYLOID 150, SYLOID 244, SYLOID 266 (all manufactured by Fuji Silysia Chemical Ltd.), NIPGEL AY-200, NIPGEL AY-6A2, NIPGEL AZ-200, NIPGEL AZ-6A0, NIPGEL BY-200, NIPGEL CX-200, NIPGEL CY-200, Nipsil E-150J, Nipsil E-220A, and Nipsil E-200A (all manufactured by Tosoh Silica Corporation).

The porous particles are preferably subjected to hydrophobic treatment. Meanwhile, the binding agent 44 contained in the binding solution 4 generally tends to have hydrophobicity. Accordingly, since the porous particles are subjected to the hydrophobic treatment, it is possible make the binding agent 44 suitably permeate the inside of the holes of the porous particles. As a result, an anchor effect is more significantly exhibited, and it is possible to realize more excellent mechanical strength of the three-dimensional structure 1 to be acquired. In addition, when the porous particles are subjected to the hydrophobic treatment, it is possible to preferably reuse the porous particles. For more specific description, when the porous particles are subjected to the hydrophobic treatment, affinity between the binder which will be described later and the porous particles decreases, and therefore the introduction of the water-soluble resin into the holes is prevented. As a result, in the manufacturing of the three-dimensional structure 1, it is possible to easily remove impurities in the porous particles in an area with no binding solution applied, by washing with water or the like, and it is possible to collect the particles with high purity. Thus, by mixing the collected three-dimensional formation powders with the binder at a predetermined ratio again, it is possible to obtain the three-dimensional formation powders reliably controlled to have a desired composition.

Any treatment may be performed as the hydrophobic treatment performed for the porous particles configuring the three-dimensional formation powders, as long as it is treatment for increasing hydrophobicity of the porous particles, and it is preferable to introduce a hydrocarbon group. Accordingly, it is possible to further increase the hydrophobicity of the particles. In addition, it is possible to easily and reliably increase uniformity of the degree of the hydrophobic treatment on each particle and each portion of the particle surface (including surface of the inside of the hole).

A compound used in the hydrophobic treatment is preferably a silane compound including a silyl group. Specific examples of the compound which can be used in the hydrophobic treatment include hexamethyldisilazane, dimethyldimethoxysilane, diethyl diethoxysilane, 1-propenyl methyl dichlorosilane, propyl dimethyl chlorosilane, propyl methyl dichlorosilane, propyl trichlorosilane, propyl triethoxysilane, propyl trimethoxysilane, styrylethyltrimethoxysilane, tetradecyl trichlorosilane, 3-thiocyanate propyl triethoxysilane, p-tolyl dimethyl chlorosilane, p-tolyl methyl dichlorosilane, p-tolyl trichlorosilane, p-tolyl trimethoxysilane, p-tolyl triethoxysilane, di-n-propyl di-n-propoxysilane, diisopropyl diisopropoxy silane, di-n-butyl di-n-butyroxy silane, di-sec-butyl di-sec-butyroxy silane, di-t-butyl di-t-butyroxy silane, octadecyl trichlorosilane, octadecyl methyldiethoxysilane, octadecyltriethoxysilane, octadecyltrimethoxysilane, octadecyldimethylchlorosilane, octadecyl methyl dichlorosilane, octadecyl methoxy dichlorosilane, 7-octenyl dimethyl chlorosilane, 7-octenyl trichlorosilane, 7-octenyl trimethoxysilane, octyl methyl dichlorosilane, octyl dimethyl chlorosilane, octyl trichlorosilane, 10-undecenyl dimethyl chlorosilane, undecyl trichlorosilane, vinyl dimethyl chlorosilane, methyl octadecyl dimethoxy silane, methyl dodecyl diethoxysilane, methyl octadecyl dimethoxy silane, methyl octadecyl diethoxy silane, n-octyl methyl dimethoxy silane, n-octyl methyldiethoxysilane, triacontyl dimethylchlorosilane, triacontyl trichlorosilane, methyl trimethoxysilane, methyl triethoxysilane, methyl tri-n-propoxysilane, methyl isobutyl propoxysilane, methyl-n-butyroxy silane, methyltri-sec-butyroxy silane, methyltri-t-butyroxy silane, ethyl trimethoxysilane, ethyl triethoxysilane, ethyltri-n-propoxysilane, ethyl iso-propoxysilane, ethyl-n-butyroxy silane, ethyltri-sec-butyroxy silane, ethyltri-t-butyroxy silane, n-propyl trimethoxy silane, isobutyl trimethoxysilane, n-hexyl trimethoxysilane, hexadecyl trimethoxysilane, n-octyl trimethoxysilane, n-dodecyl trimethoxysilane, n-octadecyl trimethoxysilane, n-propyl triethoxysilane, isobutyl triethoxysilane, n-hexyl triethoxysilane, hexadecyl triethoxysilane, n-octyl triethoxysilane, n-dodecyl trimethoxysilane, n-octadecyltriethoxysilane, 2-[2-(trichlorosilyl)ethyl]pyridine, 4-[2-(trichlorosilyl)ethyl]pyridine, diphenyldimethoxysilane, diphenyldiethoxysilane, 1,3 (trichlorosilyl methyl)heptacosane, dibenzyl dimethoxy silane, dibenzyl diethoxy silane, phenyl trimethoxysilane, phenyl methyl dimethoxy silane, phenyl dimethyl methoxy silane, phenyl dimethoxy silane, phenyl diethoxysilane, phenyl methyldiethoxysilane, phenyl dimethylethoxysilane, benzyl triethoxysilane, benzyl trimethoxysilane, benzyl methyl dimethoxy silane, benzyl dimethyl methoxy silane, benzyl dimethoxy silane, benzyl diethoxysilane, benzyl methyldiethoxysilane, benzyl dimethyl ethoxy silane, benzyl triethoxysilane, dibenzyl dimethoxy silane, dibenzyl diethoxy silane, 3-acetoxymethyl-propyl trimethoxy silane, 3-acryloxypropyl trimethoxysilane, allyl trimethoxysilane, allyl triethoxysilane, 4-aminobutyl triethoxysilane, (aminoethyl aminomethyl)phenethyl trimethoxy silane, N-(2-aminoethyl)-3-amino propyl methyl dimethoxy silane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 6-(aminohexyl aminopropyl)trimethoxysilane, p-aminophenyl trimethoxysilane, p-aminophenyl ethoxysilane, m-aminophenyl trimethoxysilane, m-aminophenyl ethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, w-amino undecyl trimethoxysilane, amyl triethoxysilane, benzoxathiepin dimethyl ester, 5-(bicycloheptenyl)triethoxysilane, bis(2-hydroxyethyl)-3-aminopropyl triethoxysilane, 8-bromo-octyl trimethoxy silane, bromophenyl trimethoxy silane, 3-bromopropyl trimethoxy silane, n-butyl trimethoxysilane, 2-chloromethyl-triethoxysilane, chloromethyl methyl diethoxysilane, chloromethyl methyl diisopropoxy silane, p-(chloromethyl)phenyl trimethoxy silane, chloromethyl triethoxysilane, chlorophenyl triethoxysilane, 3-chloropropyl methyl dimethoxy silane, 3-chloropropyl triethoxysilane, 3-chloropropyl trimethoxysilane, 2-(4-chloro-sulfonyl-phenyl)ethyl trimethoxysilane, 2-cyanoethyl triethoxysilane, 2-cyanoethyl trimethoxy silane, cyanomethyl phenethyl triethoxysilane, 3-cyanopropyl triethoxysilane, 2-(3-cyclohexenyl)ethyltrimethoxysilane, 2-(3-cyclohexenyl)ethyltriethoxysilane, 3-cyclohexenyl trichlorosilane, 2-(3-cyclohexenyl)ethyl trichlorosilane, 2-(3-cyclohexenyl)ethyl dimethyl chloro silane, 2-(3-cyclohexenyl)ethyl methyl dichloro silane, cyclohexyl dimethyl chlorosilane, cyclohexylethyldimethoxysilane, cyclohexyl methyl dichlorosilane, cyclohexyl methyl dimethoxy silane, (cyclohexylmethyl)trichlorosilane, cyclohexyl trichlorosilane, cyclohexyl trimethoxysilane, cyclooctyl trichlorosilane, (4-cyclooctenyl)trichlorosilane, cyclopentyl trichlorosilane, cyclopentyl trimethoxysilane, 1,1-diethoxy-1-silacyclopenta-3-ene, 3-(2,4-dinitrophenyl amino) propyl triethoxysilane, (dimethylchlorosilyl)methyl-7,7-dimethyl norpinane, (cyclohexylamino methyl)methyldiethoxysilane, (3-cyclopentadienyl propyl)triethoxysilane, N, N-diethyl-3-aminopropyl)trimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl triethoxysilane, (furfuryl oxymethyl)triethoxysilane, 2-hydroxy-4-(3-ethoxy propoxy)diphenyl ketone, 3-(p-methoxyphenyl)propyl methyl dichlorosilane, 3-(p-methoxyphenyl)propyl trichlorosilane, p-(methylphenethyl)methyl dichlorosilane, p-(methylphenethyl)trichlorosilane, p-(methylphenethyl)dimethyl chlorosilane, 3-morpholino-propyl trimethoxy silane, (3-glycidoxypropyl)methyldiethoxysilane, 3-glycidoxypropyl trimethoxysilane, 1,2,3,4,7,7,-hexachloro-6-methyl diethoxysilyl-2-norbornene, 1,2,3,4,7,7,-hexachloro-6-triethoxysilyl-2-norbornene, 3-iodo-propyl trimethoxysilane, 3-isocyanate propyl triethoxysilane, (mercaptomethyl)methyldiethoxysilane, 3-mercaptopropylmethyl dimethoxysilane, 3-mercaptopropyl silane, 3-mercaptopropyl triethoxysilane, 3-methacryloxypropyl methyl diethoxysilane, 3-methacryloxypropyl trimethoxysilane, methyl{2-(3-trimethoxysilyl propylamino)ethylamino}-3-propionate, 7-octenyl trimethoxysilane, R—N-α-phenethyl-N′-triethoxysilylpropyl urea, S—N-α-phenethyl-N′-triethoxysilylpropyl urea, phenethyltrimethoxysilane, phenethyl methyldimethoxysilane, phenethyl dimethyl methoxysilane, phenethyl dimethoxy silane, phenethyl diethoxymethylsilane, phenethyl methyldiethoxysilane, phenethyl dimethylethoxysilane, phenethyl ethoxy silane, (3-phenylpropyl)dimethyl chlorosilane, (3-phenylpropyl)methyl dichlorosilane, N-phenyl aminopropyltrimethoxysilane, N-(triethoxysilyl propyl)dansylamide, N-(3-triethoxysilyl propyl)-4,5-dihydro-imidazole, 2-(triethoxysilylethyl)-5-(chloro acetoxymethyl)bicycloheptane, (S)—N-triethoxysilylpropyl-O-ment carbamate, 3-(triethoxysilyl propyl)-p-nitrobenzamide, 3-(triethoxysilyl)propyl succinic anhydride, N-[5-(trimethoxysilyl)-2-aza-1-oxo-pentyl]caprolactam, 2-(trimethoxysilylethyl)pyridine, N-(trimethoxysilylethyl)benzyl-N,N,N-trimethyl ammonium chloride, phenyl vinyl diethoxysilane, 3-thiocyanate propyl triethoxysilane, (tridecafluoro-1,1,2,2,-tetrahydrocannabinol octyl)triethoxysilane, N-(3-(triethoxysilyl)propyl)phthalamide acid, (3,3,3-trifluoropropyl)methyl dimethoxy silane, (3,3,3-trifluoropropyl)trimethoxysilane, 1-trimethoxysilyl-2-(chloromethyl)phenyl ethane, 2-(trimethoxysilyl)ethyl phenyl sulfonyl azide, 3-trimethoxysilylethyl-2-pyridine, trimethoxysilylpropyl diethylene triamine, N-(3-trimethoxysilylpropyl)pyrrole, N-trimethoxysilylpropyl-N,N,N-tributyl ammonium bromide, N-trimethoxysilylpropyl-N,N,N-tributyl ammonium chloride, N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride, vinyl methyl diethoxy silane, vinyl triethoxysilane, vinyl trimethoxysilane, vinylmethyldimethoxysilane, vinyl dimethyl silane, vinyl dimethyl silane, vinyl methyl dichlorosilane, vinyl phenyl dichlorosilane, vinyl phenyl diethoxysilane, vinyl phenyl dimethyl silane, vinyl phenyl methyl chloro silane, vinyl triphenoxy silane, vinyl tris-t-butoxysilane, adamantylethyl trichlorosilane, allyl phenyl trichlorosilane, (aminoethyl aminomethyl)phenethyl trimethoxy silane, 3-aminophenoxy-dimethyl vinyl silane, phenyl trichlorosilane, phenyl dimethyl chlorosilane, phenylmethyldichlorosilane, benzyl trichlorosilane, benzyl dimethyl chlorosilane, benzyl methyl dichlorosilane, phenethyl diisopropylchlorosilane, phenethyl trichlorosilane, phenethyl dimethyl chlorosilane, phenethylmethyldichlorosilane, 5-(bicycloheptenyl)trichlorosilane, 5-(bicyclo heptenyl)triethoxysilane, 2-(bicycloheptyl)dimethylchlorosilane, 2-(bicycloheptyl)trichlorosilane, 1,4-bis(trimethoxysilyl ethyl)benzene, bromophenyl trichloro silane, 3-phenoxy propyl dimethyl chlorosilane, 3-phenoxypropyl trichlorosilane, t-butyl phenyl chlorosilane, t-butyl phenyl methoxy silane, t-butyl phenyl dichlorosilane, p-(t-butyl)phenethyl dimethyl chlorosilane, p-(t-butyl)phenethyl trichlorosilane, 1,3 (chlorodimethylsilyl methyl)heptacosane, ((chloromethyl)phenyl ethyl)dimethyl chlorosilane, ((chloromethyl)phenylethyl)methyldichlorosilane, ((chloromethyl)phenylethyl)trichlorosilane, ((chloromethyl)phenylethyl)trimethoxysilane, chlorophenyl trichlorosilane, 2-cyanoethyl trichlorosilane, 2-cyano ethyl methyl dichlorosilane, 3-cyanopropyl methyldiethoxysilane, 3-cyanopropyl methyl dichlorosilane, 3-cyanopropyl methyl dichlorosilane, 3-cyanopropyl dimethylethoxysilane, 3-cyanopropyl methyl dichlorosilane, 3-cyano-propyl trichlorosilane, fluoride alkylsilane, and one kind or a combination of two or more kinds selected from these can be used.

Among these, hexamethyldisilazane is preferably used in the hydrophobic treatment. Accordingly, it is possible to further increase the hydrophobicity of the particles. In addition, it is possible to easily and reliably increase uniformity of the degree of the hydrophobic treatment on each particle and each portion of the particle surface (including surface of the inside of the hole).

In a case of performing the hydrophobic treatment using the silane compound in a liquid phase, the particles to be subjected to the hydrophobic treatment are immersed in liquid containing the silane compound, and accordingly, it is possible to preferably proceed the desired reaction and to form a chemisorbed film of the silane compound.

In a case of performing the hydrophobic treatment using the silane compound in a gaseous phase, the particles 63 to be subjected to the hydrophobic treatment are exposed to vapor of the silane compound, and accordingly, it is possible to preferably proceed the desired reaction and to form a chemisorbed film of the silane compound.

An average particle diameter of the particles 63 configuring the three-dimensional formation powders is not particularly limited, but is preferably from 1 μm to 25 μm and more preferably from 1 μm to 15 μm. Accordingly, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1, to more effectively prevent generation of unexpected irregularities on the three-dimensional structure 1 to be manufactured, and to realize particularly excellent dimensional accuracy of the three-dimensional structure 1. In addition, it is possible to realize particularly excellent fluidity of the three-dimensional formation powders and fluidity of the three-dimensional formation compositions containing the three-dimensional formation powders and to realize particularly excellent productivity of the three-dimensional structure. In the invention, the average particle diameter means an average particle diameter based on a volume, and this can be acquired, for example, by an average particle diameter of a dispersion obtained by adding a sample to methanol and dispersing the sample with an ultrasonic dispersion device for 3 minutes, in a particle size distribution measuring device (TA-II manufactured by Coulter Electronics, Inc.) using an aperture having a diameter of 50 μm by a coulter counter method.

Dmax of the particles 63 configuring the three-dimensional formation powders is preferably from 3 μm to 40 μm and more preferably from 5 μm to 30 μm. Accordingly, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1, to more effectively prevent generation of unexpected irregularities on the three-dimensional structure 1 to be manufactured, and to realize particularly excellent dimensional accuracy of the three-dimensional structure 1. In addition, it is possible to realize particularly excellent fluidity of the three-dimensional formation powders and fluidity of the three-dimensional formation compositions containing the three-dimensional formation powders and to realize particularly excellent productivity of the three-dimensional structure 1. Further, it is possible to more effectively prevent scattering of light due to the particles 63 on the surface of the three-dimensional structure 1 to be manufactured.

When the particles 63 are porous particles, a porosity of the porous particles is preferably equal to or greater than 50% and more preferably from 55% to 90%. Accordingly, a space (hole) for the curable resin to be introduced is sufficiently provided, and it is possible to realize excellent mechanical strength of the porous particles themselves. As a result, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1 formed by the binding resin permeating the inside of the hole. In the invention, the porosity of the particles means a ratio (volume ratio) of holes present inside of the particles to apparent volume of the particles, and is a value represented by {(ρ₀-ρ/(ρ₀}×100, when a density of the particles is set as p [g/cm³] and a true density of the constituent material of the particles is set as ρ₀ [g/cm³].

When the particles 63 are porous particles, an average hole diameter (pore diameter) of the porous particles is preferably equal to or greater than 10 nm and is more preferably from 50 nm to 300 nm. Accordingly, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1 to be finally acquired. In addition, in a case of using a colored binder containing a pigment in manufacturing the three-dimensional structure 1, it is possible to preferably hold the pigment in the holes of the porous particles. Therefore, it is possible to prevent unexpected diffusion of the pigment and to more reliably form a high definition image.

The particles configuring the three-dimensional formation powders may have any shapes, but preferably have a spherical shape. Accordingly, it is possible to realize particularly excellent fluidity of the three-dimensional formation powders and fluidity of the three-dimensional formation compositions containing the three-dimensional formation powders, to realize particularly excellent productivity of the three-dimensional structure 1, to more effectively prevent generation of unexpected irregularities on the three-dimensional structure 1 to be manufactured, and to realize particularly excellent dimensional accuracy of the three-dimensional structure 1.

The three-dimensional formation powders may contain the plurality types of particles having different conditions described above (for example, types of constituent materials of the particles and the hydrophobic treatment) from each other.

A void ratio of the three-dimensional formation powders is preferably from 70% to 98% and more preferably from 75% to 97.7%. Accordingly, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure. In addition, it is possible to realize particularly excellent fluidity of the three-dimensional formation powders and fluidity of the three-dimensional formation compositions containing the three-dimensional formation powders, to realize particularly excellent productivity of the three-dimensional structure, to more effectively prevent generation of unexpected irregularities on the three-dimensional structure to be manufactured, and to realize particularly excellent dimensional accuracy of the three-dimensional structure. In the invention, the void ratio of the three-dimensional formation powders means a ratio of sum of a volume of voids included in all particles configuring the three-dimensional formation powders and a volume of voids present between the particles, to a capacity of a container, in a case where a container having predetermined capacity (for example, 100 mL) is filled with the three-dimensional formation powders, and is a value represented by {(P₀−P)/P₀}×100, when a bulk density of the three-dimensional formation powders is set as P [g/cm³] and a true density of the constituent material of the three-dimensional formation powders is set as P₀ [g/cm³].

A content rate of the three-dimensional formation powders in the three-dimensional formation compositions is preferably from 10% by mass to 90% by mass and more preferably from 15% by mass to 58% by mass. Accordingly, it is possible to realize sufficiently excellent fluidity of the three-dimensional formation compositions and to realize particularly excellent mechanical strength of the three-dimensional structure 1 to be finally acquired.

Binder

The three-dimensional formation compositions contain the plurality of particles 63 and the binder 64. By containing the binder 64, it is possible to bind (temporarily fix) the particles 63 to each other (see FIG. 3) and to effectively prevent unexpected scattering of the particles 63. Therefore, it is possible to realize safety of an operator and improvement of dimensional accuracy of the three-dimensional structure 1 to be manufactured. The binder is also used for the permeation prevention agent described above. For the binder or a resin component of the resin emulsion as the binder, a material having water repellency (for example, fluorine-based material) is excluded. Accordingly, in the non-bound particles removing step described above, even when using a method of applying liquid such as water, it is possible to more easily dissolve the binder and to more reliably remove the particles from the three-dimensional structure 1.

In the invention, a binder may be used as long as a part thereof is soluble in water, but solubility with respect to water (mass soluble in 100 g of water) at 25° C. is, for example, preferably equal to or greater than 5 [g/100 g of water] and more preferably equal to or greater than 10 [g/100 g of water].

Examples of the binder 64 include a synthetic polymer such as polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), sodium polyacrylate, polyacrylamide, modified polyamide, polyethylene imine, or polyethylene oxide, a natural polymer such as corn starch, mannan, pectin, agar, alginic acid, dextran, glue, or gelatin, and a semisynthetic polymer such as carboxymethyl cellulose, hydroxyethyl cellulose, oxidized starch, or modified starch, and one kind or a combination of two or more kinds selected from these can be used.

Examples of the product of the binder include methyl cellulose (product name “METOLOSE SM-15” manufactured by Shin-Etsu Chemical Co., Ltd.), hydroxyethyl cellulose (product name “AL-15” manufactured by FUJI Chemical Inc.), hydroxypropyl cellulose (product name “HPC-M” manufactured by Nippon Soda Co., Ltd.), Carboxymethyl cellulose (product name “CMC-30” manufactured by Nichirin Chemical Industries, Ltd.), sodium starch phosphate (I) (product name “Hoster 5100” manufactured by Matsutani Chemical Industry Co., Ltd.), polyvinylpyrrolidone (product name “PVP K-90” manufactured by Tokyo Chemical Co., LTd.), a methyl vinyl ether/maleic anhydride copolymer (product name “AN-139” manufactured by GAF Gauntlet), polyacrylamide (manufactured by Wako Pure Chemical Industries, Ltd.), modified polyamide (modified nylon) (“AQ nylon” manufactured by Toray Industries, Inc.), polyethylene oxide (product name “PEO-1” manufactured by Seitetsu Kagaku Kogyo K.K.), an ethylene oxide/propylene oxide random copolymer (product name “ALKOX EP” manufactured by Meisei Chemical Works, Ltd.), sodium polyacrylate (manufactured by Wako Pure Chemical Industries, Ltd.), and a carboxyvinyl polymer/crosslinked acrylic binder (product name “AQUPEC” manufactured by Sumitomo Seika Chemicals Co., Ltd.)

Among these, when the binder 64 is polyvinyl alcohol, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1. In addition, by adjusting a degree of saponification or a degree of polymerization, it is possible to more preferably control characteristics (for example, water solubility or water resistance) of the binder 64 or characteristics (for example, viscosity, fixing force of particles 63, or wettability) of the three-dimensional formation compositions. Therefore, it is possible to more preferably respond the manufacturing of various shapes of the three-dimensional structure 1. In addition, among the various binders, polyvinyl alcohol is provided with a low cost and the supply thereof is stable. Thus, it is possible to perform stable manufacturing of the three-dimensional structure 1 while keeping a production cost low.

When the binder 64 contains polyvinyl alcohol, a degree of saponification of the polyvinyl alcohol is preferably from 85 to 90. Accordingly, it is possible to prevent a decrease in solubility of polyvinyl alcohol with respect to water. Therefore, when the three-dimensional formation compositions contain water, it is possible to more effectively prevent a decrease in adhesiveness between the unit layers 7 adjacent to each other.

When the binder 64 contains polyvinyl alcohol, a degree of polymerization of the polyvinyl alcohol is preferably from 300 to 1000. Accordingly, when the three-dimensional formation compositions contain water, it is possible to realize particularly excellent mechanical strength of each unit layer 7 and adhesiveness between the unit layers 7 adjacent to each other.

When the binder 64 is polyvinyl pyrrolidone (PVP), the following effects are obtained. That is, since polyvinyl pyrrolidone has excellent adhesiveness with respect to various materials such as glass, metal, and plastic, it is possible to realize particularly excellent strength and stability of the shape of the portion of the layer 6 to which the binding solution is not applied, and to realize particularly excellent dimensional accuracy of the three-dimensional structure 1 to be finally acquired. Since polyvinyl pyrrolidone has high solubility with respect to various organic solvents, when the three-dimensional formation compositions contain an organic solvent, it is possible to realize particularly excellent fluidity of the three-dimensional formation compositions, to preferably form the layer 6 in which unexpected unevenness in the thickness is more effectively prevented, and to realize particularly excellent dimensional accuracy of the three-dimensional structure 1 to be finally acquired. Since polyvinyl pyrrolidone has high solubility with respect to water, it is possible to easily and reliably remove the non-bound particles by the binding agent 44 among the particles 63 configuring each layer 6, in the removing step of the non-bound particles (after completing the formation). Since polyvinyl pyrrolidone has appropriate affinity with three-dimensional formation powders, the introduction thereof into the holes 611 as described above does not sufficiently occur, but wettability with respect to the surface of the particle 63 is comparatively high. Accordingly, it is possible to more effectively exhibit a function of temporarily fixing as described above. Since polyvinyl pyrrolidone has excellent affinity with various colorants, it is possible to effectively prevent unexpected diffusion of the colorant, in a case where a binding solution 4 containing a colorant is used in the discharge step. Since polyvinyl pyrrolidone has an antistatic function, it is possible to effectively prevent scattering of powders, when using the powders which is not a paste state, as the three-dimensional formation compositions in the layer formation step. In a case of using paste as the three-dimensional formation composition in the layer formation step, when the paste-like three-dimensional formation composition contains polyvinyl pyrrolidone, it is possible to effectively prevent bubbles generating in the three-dimensional formation composition and to more effectively prevent generation of defects due to bubbles in the layer formation step.

When the binder 64 contains polyvinyl pyrrolidone, a weight average molecular weight of the polyvinyl pyrrolidone is preferably from 10,000 to 1,700,000 and more preferably from 30,000 to 1,500,000. Accordingly, it is possible to more effectively exhibit the functions described above.

In the three-dimensional formation composition, the binder 64 is preferably formed in a liquid state (for example, a dissolved state or a melted state) at least in the layer formation step. Accordingly, it is possible to further increase uniformity in the thickness of the layer 6 formed using the three-dimensional formation composition.

A content rate of the binder 64 in the three-dimensional formation composition is preferably equal to or smaller than 15% by volume and more preferably from 2% by volume to 5% by volume, with respect to the true volume of the three-dimensional formation powder. Accordingly, it is possible to sufficiently exhibit the functions of the binder 64 described above, to ensure wider spaces for permeation of the binding solution 4, and to realize particularly excellent mechanical strength of the three-dimensional structure 1.

Solvent

The three-dimensional formation compositions may contain a solvent in addition to the binder 64 and the three-dimensional formation powders. Accordingly, it is possible to realize particularly excellent fluidity of the three-dimensional formation compositions and to realize particularly excellent productivity of the three-dimensional structure 1.

The solvent preferably dissolves the binder 64. Accordingly, it is possible to realize excellent fluidity of the three-dimensional formation compositions and more effectively prevent unexpected unevenness in the thickness of the layer 6 formed using the three-dimensional formation compositions. In addition, when the layer 6 is formed in a state where the solvent is removed, it is possible to adhere the binder 64 to the particle 63 with higher uniformity over the entire layer 6 and to more effectively prevent generation of unexpected non-uniformity in the composition. Therefore, it is possible to more effectively prevent unexpected variation in the mechanical strength of each portion of the three-dimensional structure 1 to be finally acquired and to increase reliability of the three-dimensional structure 1.

As the solvent, it is preferable to use a water-soluble solvent. Accordingly, it is possible to realize particularly excellent fluidity of the three-dimensional formation structure and to more easily form a layer having a uniform thickness.

Examples of the solvent configuring the three-dimensional formation compositions include water; an alcohol-based solvent such as methanol, ethanol, or isopropanol; a ketone-based solvent such as methylethyl ketone or acetone; a glycol ether-based solvent such as ethylene glycol monoethyl ether or ethylene glycol monobutyl ether; a glycol ether acetate-based solvent such as propylene glycol 1-monomethyl ether 2-acetate or propylene glycol 1-monomethyl ether 2-acetate; polyethylene glycol; and polypropylene glycol, and one kind or a combination of two or more kinds selected from these can be used.

Among these, the three-dimensional formation compositions preferably contain water. Accordingly, it is possible to more reliably dissolve the binder 64 and to realize particularly excellent fluidity of the three-dimensional formation compositions and uniformity of the composition of the layer 6 formed using the three-dimensional formation compositions. In addition, the water is easily removed after forming the layer 6, and a negative effect hardly occurs even when water remains in the three-dimensional structure 1. Further, the water is advantageous in viewpoints of safety for a human body and environmental problems.

When the three-dimensional formation compositions contain the solvent, a content rate of the solvent in the three-dimensional formation compositions is preferably from 5% by mass to 75% by mass and more preferably from 35% by mass to 70% by mass. Accordingly, the effects obtained by containing the solvent as described above are more significantly exhibited and it is possible to easily remove the solvent in the manufacturing process of the three-dimensional structure 1 in a short time, and therefore, it is advantageous in a viewpoint of improvement of the productivity of the three-dimensional structure 1.

Particularly, when the three-dimensional formation compositions contain water, a content rate of water in the three-dimensional formation compositions is preferably from 20% by mass to 73% by mass and more preferably from 50% by mass to 70% by mass. Accordingly, the effects described above are more significantly exhibited.

Other Components

The three-dimensional formation compositions may further contain components other than the components described above. Examples of such components include a polymerization initiator; a polymerization promoter, a permeation promoter; a wetting agent (moisturizing agent); a fixing agent; an antifungal agent; a preservative; an antioxidant; an ultraviolet absorber; a chelating agent; and a pH adjuster.

3. Binding Solution

The binding solution used in the manufacturing of the three-dimensional structure of the invention will be described in detail.

Binding Agent

The binding solution 4 at least contains the binding agent 44.

The binding agent 44 is a component having a function of binding the particles 63 by curing.

The binding agent 44 is not particularly limited, and a binding agent having hydrophobicity (lipophilicity) is preferably used. Accordingly, when using the binding agent subjected to hydrophobic treatment as the particles 63, for example, it is possible to increase affinity between the binding solution 4 and the particles 63, and it is possible to cause the binding solution 4 to preferably permeate the holes 611 of the particles 63, by the binding solution 4 applied to the layer 6. As a result, an anchor effect is preferably exhibited by the binding agent 44, and it is possible to realize excellent mechanical strength of the three-dimensional structure 1 to be finally acquired. In the invention, any hydrophobic curable resins may be used as long as affinity with respect to water is sufficiently low, but solubility with respect to water at 25° C. is preferably equal to or smaller than 1 [g/100 g of water].

Examples of the binding agent 44 include a thermoplastic resin; a thermosetting resin; various photo-curable resins such as a visible light curable resin (photo-curable resin in a narrow sense) which cures by light in a visible light region, an ultraviolet curable resin, and an infrared curable resin; and an X-ray curable resin, and one kind or a combination of two or more kinds selected from these can be used. Among these, the binding agent 44 is preferably the curable resin, in the viewpoints of the mechanical strength of the three-dimensional structure 1 to be acquired or the productivity of the three-dimensional structure 1. Among various curable resins, the ultraviolet curable resin (polymerizable compound) is particularly preferable in the viewpoints of the mechanical strength of the three-dimensional structure 1 to be obtained or the productivity of the three-dimensional structure 1 and storage stability of the binding solution 4.

As the ultraviolet curable resin (polymerizable compound), it is preferable to use a resin in which addition polymerization or ring-opening polymerization is started by radical species or cationic species generated from a photoinitiator by ultraviolet ray irradiation and which generates a polymer. Examples of a polymerization method of the addition polymerization include radical, cationic, anionic, metathesis, and coordination polymerizations. In addition, Examples of a polymerization method of the ring-opening polymerization include cationic, anionic, radical, metathesis, and coordination polymerizations.

As an addition polymerizable compound, a compound having at least one ethylenically unsaturated double bond is used, for example. As the addition polymerizable compound, a compound having at least one and preferably two or more ethylenically unsaturated bond at the terminal can be preferably used.

The ethylenically unsaturated polymerizable compound has a chemical form of a monofunctional polymerizable compound and a polyfunctional polymerizable compound or a mixture thereof. Examples of the monofunctional polymerizable compound include unsaturated carboxylic acid (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, and maleic acid) or esters and amides thereof. Examples of the polyfunctional polymerizable compound include ester of unsaturated carboxylic acid and an aliphatic polyalcohol compound and amides of unsaturated carboxylic acid and an aliphatic polyvalent amine compound.

In addition, an addition reactant of unsaturated carboxylic acid ester or amides having a hydroxyl group or a nucleophilic substituent such as an amino group and a mercapto group, and isocyanates and epoxies, and a dehydration condensation reactant with carboxylic acid can also be used. Further, an addition reaction product of unsaturated carboxylic acid ester or amides having an electrophilic substituent such as an isocyanate group or an epoxy group, and alcohols, amines, and thiols, and a substitution reactant of unsaturated carboxylic acid ester or amides having an eliminating substituent such as a halogen group or a tosyloxy group, and alcohols, amines, and thiols can also be used.

As a specific example of a radical polymerizable compound which is ester of unsaturated carboxylic acid and aliphatic polyhydric alcohol, ester(meth)acrylate is representative, for example, and any of monofunctional or polyfunctional compound can be used.

Specific examples of the monofunctional (meth)acrylate include tolyl oxyethyl(meth)acrylate, phenyloxyethyl(meth)acrylate, cyclohexyl(meth)acrylate, ethyl(meth)acrylate, methyl(meth)acrylate, isobornyl(meth)acrylate, and tetrahydrofurfuryl(meth)acrylate.

Specific examples of the bifunctional (meth)acrylate include ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, tetramethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, hexanediol di(meth)acrylate, 1,4-cyclohexane diol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, and dipentaerythritol di(meth)acrylate.

Specific examples of the trifunctional (meth)acrylate include trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, alkylene oxide-modified tri(meth)acrylate of trimethylolpropane, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, trimethylolpropane tri((meth)acryloyloxypropyl)ether, isocyanuric acid alkylene oxide-modified tri(meth)acrylate, propionic acid dipentaerythritol tri(meth)acrylate, tri((meth)acryloyloxyethyl)isocyanurate, hydroxypivalaldehyde-modified dimethylol propane tri(meth)acrylate, and sorbitol tri(meth)acrylate.

Specific examples of the tetrafunctional (meth)acrylate include pentaerythritol tetra(meth)acrylate, sorbitol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol propionate tetra(meth)acrylate, and ethoxylated pentaerythritol tetra(meth)acrylate.

Specific examples of the pentafunctional (meth)acrylate include sorbitol penta(meth)acrylate and dipentaerythritol penta(meth)acrylate.

Specific examples of the hexafunctional (meth)acrylate include dipentaerythritol hexa(meth)acrylate, sorbitol hexa(meth)acrylate, alkylene oxide-modified hexa(meth)acrylate of phosphazene, and caprolactone-modified dipentaerythritol hexa(meth)acrylate.

Examples of the polymerizable compound other than (meth)acrylate include itaconic acid esters, crotonic acid esters, isocrotonic acid esters, and maleic acid esters.

Examples of itaconic acid ester include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaerythritol diitaconate, and sorbitol tetraitaconate.

Examples of crotonic acid ester include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, and sorbitol tetra-dicrotonate.

Examples of isocrotonic acid ester include ethylene glycol iso crotonate, pentaerythritol iso crotonate, and sorbitol tetraisocrotonate.

Examples of maleic acid ester include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaerythritol dimaleate, and sorbitol tetra malate.

Examples of other ester include aliphatic alcohol-based esters disclosed in JP-B-46-27926, JP-B-51-47334, and JP-A-57-196231, a compound having an aromatic skeleton disclosed in JP-A-59-5240, JP-A-59-5241, and JP-A-2-226149, and a compound containing an amino group disclosed in JP-A-1-165613.

Specific examples of a monomer of amide of unsaturated carboxylic acid and an aliphatic polyvalent amine compound include methylenebis-acrylamide, methylene bis-methacrylamide, 1,6-hexamethylene-bis-acrylamide, 1,6-hexamethylene-bis-methacrylamide, diethylenetriamine trisacrylamide, xylylene bisacrylamide, and xylylene bismethacrylamide.

Examples of other preferable amide-based monomer include a monomer having a cyclohexylene structure disclosed in JP-B-54-21726.

An urethane-based addition polymerizable compound manufactured using the addition reaction of isocyanate and a hydroxyl group is also preferable, and specific examples thereof include a vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule obtained by adding a vinyl monomer containing a hydroxyl group represented by the following Formula (1) to a polyisocyanate compound including two or more isocyanate groups in one molecule disclosed in JP-B-48-41708.

CH₂═C(R¹)COOCH₂CH(R²)OH  (1)

(Herein, in Formula (1), R¹ and R² each independently represent H or CH₃.)

In the invention, a cationic ring-opening polymerizable compound having one or more cyclic ether groups such as an epoxy group or an oxetane group in a molecule can be preferably used as the ultraviolet curable resin (polymerizable compound).

As the cationic polymerizable compound, for example, a thermosetting compound containing ring-opening polymerizable compounds is used, for example, and among these, a heterocyclic group-containing curable compound is particularly preferable. Examples of such a curable compound include cyclic imino ethers such as an epoxy derivative, an oxetane derivative, a tetrahydrofuran derivative, a cyclic lactone derivative, a cyclic carbonate derivative, or an oxazoline derivative, and vinyl ethers, and among these, an epoxy derivative, an oxetane derivative, and vinyl ethers are preferable.

Preferable examples of an epoxy derivative include monofunctional glycidyl ethers, polyfunctional glycidyl ethers, monofunctional alicyclic epoxides, and polyfunctional alicyclic epoxies.

Specific examples of compounds of glycidyl ethers include diglycidyl ethers (for example, ethylene glycol diglycidyl ether or bisphenol A diglycidyl ether), tri- or higher functional glycidyl ethers (for example, trimethylol ethane triglycidyl ether, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether, or triglycidyl tris-hydroxyethyl isocyanurate), tetra- or higher glycidyl ethers (for example, sorbitol tetraglycidyl ether, pentaerythritol tetraglycidyl ether, polyglycidyl ether of a cresol novolac resin, or polyglycidyl ether of a phenol novolac resin), alicyclic epoxies (for example, CELLOXIDE 2021P, CELLOXIDE 2081, EPOLEAD GT-301, or EPOLEAD GT-401 (all manufactured by Daicel Corporation), EHPE (manufactured by Daicel Corporation), or polycyclohexyl epoxy methyl ethers of a phenol novolac resin), and oxetanes (for example, OX-SQ or PNOX-1009 (all manufactured by Toagosei Company, Limited.)

As the polymerizable compound, an alicyclic epoxy derivative can be preferably used. The “alicyclic epoxy group” is a substructure obtained by epoxidizing a double bond of a cycloalkene ring such as a cyclopentene group or a cyclohexene group by a suitable oxidant such as hydrogen peroxide or peracetic acid.

As the alicyclic epoxy compound, a polyfunctional alicyclic epoxies having two or more cyclohexene oxide groups or cyclopentene oxide groups in one molecule are preferable. Specific examples of the alicyclic epoxy compound include 4-vinyl cyclohexene dioxide, (3,4-epoxy cyclohexyl)methyl-3,4-epoxy cyclohexyl carboxylate, di(3,4-epoxy cyclohexyl)adipate, di(3,4-epoxycyclohexylmethyl)adipate, bis(2,3-epoxy cyclopentyl)ether, di(2,3-epoxy-6-methylcyclohexylmethyl)adipate, and dicyclopentadiene oxide.

A general glycidyl compound having an epoxy group and not having an alicyclic structure in a molecule can be used alone or can be used with the alicyclic epoxy compound described above.

As a general glycidyl compound, a glycidyl ether compound or a glycidyl ester compound can be used, for example, and it is preferable to use with a glycidyl ether compound.

Specific examples of the glycidyl ether compound include an aromatic glycidyl ether compound such as 1,3-bis(2,3-epoxypropyloxy)benzene, a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, a phenol.novolac type epoxy resin, a cresol.novolac type epoxy resin, or trisphenolmethane type epoxy resin, and an aliphatic glycidyl ether compound such as 1,4-butanediol glycidyl ether, glycerol triglycidyl ether, propylene glycol diglycidyl ether, or trimethylolpropane triglycidyl ether. Examples of glycidyl ester include glycidyl ester of a linoleic acid dimer.

As the polymerizable compound, a compound having an oxetanyl group which is a four-membered cyclic ether (hereinafter, also simply referred to as an “oxetane compound”) can be used. The oxetanyl-group containing compound is a compound having one or more oxetanyl groups in one molecule.

A content rate of the binding agent 44 in the binding solution 4 is preferably equal to or greater than 80% by mass and more preferably equal to or greater than 85% by mass. Accordingly, it is possible to realize particularly excellent mechanical strength of the three-dimensional structure 1 to be finally acquired.

Other Components

The binding solution 4 may further contain components other than the components described above. Examples of such components include various colorants such as a pigment or dye; a dispersant; a surfactant; a polymerization initiator; a polymerization promoter; a solvent; a permeation promoter; a wetting agent (moisturizing agent); a fixing agent; an antifungal agent; a preservative; an antioxidant; an ultraviolet absorber; a chelating agent; a pH adjuster; a thickener; a filler; an aggregation prevention agent; and an antifoaming agent.

Particularly, when the binding solution 4 contains a colorant, it is possible to obtain the three-dimensional structure 1 colored in a color corresponding to the color of the colorant.

Particularly, by containing a pigment as a colorant, it is possible to realize excellent light resistance of the binding solution 4 and the three-dimensional structure 1. As a pigment, any one of an inorganic pigment and an organic pigment can be used.

Examples of the inorganic pigment include carbon blacks (C.I. Pigment Black 7) such as furnace black, lamp black, acetylene black, or channel black, iron oxide, and titanium oxide, and one kind or a combination of two or more kinds selected from these can be used.

Among the inorganic pigments, titanium oxide is preferable, in order to realize a preferable white color.

Examples of the organic pigment include an azo pigment such as an insoluble azo pigment, a condensed azo pigment, azo lake, or a chelate azo pigment, a polycyclic pigment such as a phthalocyanine pigment, a perylene and perinone pigment, an anthraquinone pigment, a quinacridone pigment, a dioxane pigment, a thioindigo pigment, an isoindolinone pigment, or a quinophthalone pigment, dye chelates (for example, base dye chelates or acidic dye chelates), dye lake (basic dye lake or acidic dye lake), a nitro pigment, a nitroso pigment, aniline black, and a daylight fluorescent pigment, and one kind or a combination of two or more kinds selected from these can be used.

Specifically, examples of carbon black used as a black pigment include No. 2300, No. 900, MCF88, No. 33, No. 40, No. 45, No. 52, MA7, MA8, MA100, No. 2200B (all manufactured by Mitsubishi Chemical Corporation), Raven 5750, Raven 5250, Raven 5000, Raven 3500, Raven 1255, Raven 700 (all manufactured by Carbon Columbia), Regal 400R, Regal 330R, Regal 660R, Mogul L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400 (all manufactured by CABOT JAPAN K.K.), Color Black FW1, Color Black FW2, Color Black FW2V, Color Black FW18, Color Black FW200, Color Black 5150, Color Black 5160, Color Black S170, Printex 35, Printex U, Printex V, Printex 140U, Special Black 6, Special Black 5, Special Black 4A, and Special Black 4 (all manufactured by Degussa).

Examples of a white pigment include C.I. Pigment White 6, 18, and 21.

Examples of a yellow pigment include C.I. Pigment Yellow 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 16, 17, 24, 34, 35, 37, 53, 55, 65, 73, 74, 75, 81, 83, 93, 94, 95, 97, 98, 99, 108, 109, 110, 113, 114, 117, 120, 124, 128, 129, 133, 138, 139, 147, 151, 153, 154, 167, 172, and 180.

Examples of a magenta pigment include C.I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 21, 22, 23, 30, 31, 32, 37, 38, 40, 41, 42, 48(Ca), 48(Mn), 57(Ca), 57:1, 88, 112, 114, 122, 123, 144, 146, 149, 150, 166, 168, 170, 171, 175, 176, 177, 178, 179, 184, 185, 187, 202, 209, 219, 224, and 245, or C.I. Pigment Violet 19, 23, 32, 33, 36, 38, 43, and 50.

Examples of a cyan pigment include C.I. Pigment Blue 1, 2, 3, 15, 15:1, 15:2, 15:3, 15:34, 15:4, 16, 18, 22, 25, 60, 65, 66, and C.I. Vat Blue 4 and 60.

Examples of other pigments include C.I. Pigment Green 7 and 10, C.I. Pigment Brown 3, 5, 25, and 26, and C.I. Pigment Orange 1, 2, 5, 7, 13, 14, 15, 16, 24, 34, 36, 38, 40, 43, and 63.

When the binding solution 4 contains the pigments, an average particle diameter of the pigments is preferably equal to or smaller than 300 nm and more preferably from 50 nm to 250 nm. Accordingly, it is possible to realize particularly excellent discharge stability of the binding solution 4 and dispersion stability of the pigments in the binding solution 4 and to form an image having more excellent image quality.

In a case where the binding solution 4 contains a pigment and the particles 63 are porous, when an average hole diameter of the particles is set as d1 [nm] and an average particle diameter of the particles is set as d2 [nm], it is preferable to satisfy a relationship of d1/d2>1 and it is more preferable to satisfy a relationship of 1.1≦d1/d2≦6. By satisfying such a relationship, it is possible to preferably hold the pigment in the holes of the particles 63. Therefore, it is possible to prevent unexpected diffusion of the pigment and to more reliably form a high definition image.

Examples of a dye include an acid dyes, a direct dye, a reactive dye, and a basic dye, and one kind or a combination of two or more kinds selected from these can be used.

Specific example of the dye include C.I. Acid Yellow 17, 23, 42, 44, 79, and 142, C.I. Acid Red 52, 80, 82, 249, 254, and 289, C.I. Acid Blue 9, 45, and 249, C.I. Acid Black 1, 2, 24, and 94, C.I. Food Black 1 and 2, C.I. Direct yellow 1, 12, 24, 33, 50, 55, 58, 86, 132, 142, 144, and 173, C.I. Direct Red 1, 4, 9, 80, 81, 225, and 227, C.I. Direct Blue 1, 2, 15, 71, 86, 87, 98, 165, 199, and 202, C.I. Direct Black 19, 38, 51, 71, 154, 168, 171, and 195, C.I. Reactive Red 14, 32, 55, 79, and 249, and C.I. Reactive Black 3, 4, and 35.

When the binding solution 4 contains the colorant, a content rate of the colorant in the binding solution 4 is preferably from 1% by mass to 20% by mass. Accordingly, particularly excellent concealing properties and color reproducibility are obtained.

Particularly, when the binding solution 4 contains titanium oxide as the colorant, a content rate of the titanium oxide in the binding solution 4 is preferably from 12% by mass to 18% by mass and more preferably from 14% by mass to 16% by mass. Accordingly, particularly excellent concealing properties are obtained.

When the binding solution 4 contains a pigment and a dispersant, it is possible to realize more excellent dispersibility of the pigment. As a result, it is possible to more effectively prevent a partial decrease in mechanical strength due to deviation of the pigment.

The dispersant is not particularly limited, but a dispersant commonly used for manufacturing a pigment dispersion such as a polymer dispersant is used, for example. Specific examples of the polymer dispersant include materials having one or more kinds of polyoxyalkylene polyalkylene polyamine, vinyl-based polymer and copolymer, acrylic polymer and copolymer, polyester, polyamide, polyimide, polyurethane, an amino-based polymer, a silicon-containing polymer, a sulfur-containing polymer, a fluorine-containing polymer, and an epoxy resin, as a main component. Examples of a commercially available product of the polymer dispersant include AJISPER series manufactured by Ajinomoto Fine-Techno Co., Inc., Solsperse series (Solsperse 36000 or the like) available from Noveon Inc., DISPERBYK series manufactured by BYK Japan K. K., and DISPARLON series manufactured by Kusumoto Chemicals, Ltd.

When the binding solution 4 contains a surfactant, it is possible to realize more excellent abrasion resistance of the three-dimensional structure 1. The surfactant is not particularly limited, and for example, polyester-modified silicone or ether-modified silicone as a silicone-based surfactant can be used, and among these, polyether-modified polydimethylsiloxane or polyester-modified polydimethylsiloxane is preferably used. Specific examples of the surfactant include BYK-347, BYK-348, BYK-UV3500, 3510, 3530, and 3570 (product names all manufactured by BYK Japan K. K.)

The binding solution 4 may contain a solvent. Accordingly, it is possible to preferably perform adjustment of the viscosity of the binding solution 4, and even when the binding solution 4 contains a component having high viscosity, it is possible to realize particularly excellent discharge stability of the binding solution by an ink jet method.

Examples of the solvent include (poly)alkylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol monoethyl ether; acetates such as ethyl acetate, n-propyl acetate, iso-propyl acetate, n-butyl acetate, and iso-butyl acetate; aromatic hydrocarbons such as benzene, toluene, and xylene; ketones such as methyl ethyl ketone, acetone, methyl isobutyl ketone, ethyl-n-butyl ketone, diisopropyl ketone, and acetylacetone; and alcohols such as ethanol, propanol, and butanol, and one kind or a combination of two or more kinds selected from these can be used.

A viscosity of the binding solution 4 is preferably from 10 mPa·s to 25 mPa·s and more preferably from 15 mPa·s to 20 mPa·s. Accordingly, it is possible to realize particularly excellent discharge stability of the binding solution by an ink jet method. In the specification, the viscosity is a value measured at 25° C. using an E-type viscometer (VISCONIC ELD manufactured by TOKYO KEIKI INC.)

In a case of using the plurality of kinds of the binding solutions 4, at least, it is preferable to use a cyan binding solution 4, a magenta binding solution 4, and a yellow binding solution 4. Accordingly, it is possible to more widen the color reproduction area which can be expressed by combining the binding solutions 4.

In addition, by using a white binding solution 4 and another colored binding solution 4 together, the following effects are obtained, for example. That is, the three-dimensional structure 1 to be finally acquired can include a first area to which the white binding solution 4 is applied, and an area (second area) which is superposed with the first area and provided on an outer surface side with respect to the first area and to which a colored binding solution 4, other than white, is applied. Accordingly, the first area to which the white binding solution 4 is applied, can exhibit concealing properties, and it is possible to more increase a chroma of the three-dimensional structure 1.

In addition, by using the white binding solution 4 and the black binding solution 4, and the other colored binding solution 4 together, the following effects are obtained, for example. That is, it is possible to reproduce a hue having high brightness and lighter than a hue reproducible with the other colored binding solution 4 by using the white binding solution 4 together, it is possible to reproduce a hue having low brightness and lighter than a hue reproducible with the other colored binding solution 4 by using the black binding solution together, and it is possible to increase a hue of the three-dimensional structure 1 and to widen a range of brightness reproduction.

Hereinabove, the preferred embodiments of the invention have been described, but the invention is not limited thereto.

For example, in the embodiments described above, in addition to the layer formation step, the permeation prevention step, and the discharge step, the curing step has also been repeatedly performed with the layer formation step, the permeation prevention step, and the binding solution application step, but the curing step may not be repeatedly performed. For example, the step may be collectively performed after a laminate including the plurality of uncured layers is formed. When the curable resin is not a curable component, the curing step can be omitted.

In addition, in the manufacturing method of the invention, a pretreatment step, an intermediate treatment step, and a post-treatment step may be performed, if necessary.

As the pretreatment step, a cleaning step of the formation stage is used, for example.

Examples of the post-treatment step include a washing step, a shape adjustment step of performing deburring or the like, a coloring step, a coated layer formation step, and a curable resin curing completion step of performing a light irradiation process or a heating process for reliably curing the uncured curable resin.

In the embodiment described above, all layers have been described as the layers to which the binding solution is applied, but the layers to which the binding solution is not applied, may be included. For example, the layers formed directly above the formation stage may be set as a layer to which the binding solution is not applied, and may function as a sacrificial layer.

In the embodiments described above, the case of performing the binding solution application step by an ink jet method has been mainly described, but the binding solution application step may be performed using other methods (for example, other printing methods).

The entire disclosure of Japanese Patent Application No. 2014-053143 filed Mar. 17, 2014 is expressly incorporated by reference here in. 

What is claimed is:
 1. A manufacturing method of a three-dimensional structure which manufactures a three-dimensional structure by laminating layers, the method comprising: forming the layers using a three-dimensional formation composition containing three-dimensional formation powders, a solvent, and a binder; discharging a binding solution containing a binding agent to the layers; and performing a permeation prevention step of preventing the solvent from permeating the layers, at least on a part of the layers to which the binding solution is discharged.
 2. The manufacturing method of a three-dimensional structure according to claim 1, wherein the permeation prevention process is selectively performed with respect to an area of the layers to which the binding solution is not discharged.
 3. The manufacturing method of a three-dimensional structure according to claim 1, wherein the permeation prevention process is performed by applying a permeation prevention agent containing the binder.
 4. The manufacturing method of a three-dimensional structure according to claim 3, wherein the application of the permeation prevention agent is performed by any one of a group consisting of an ink jet method, a squeegee method, a transfer method, or a sublimation method.
 5. The manufacturing method of a three-dimensional structure according to claim 1, wherein the solvent is water-soluble.
 6. A three-dimensional structure which is manufactured by the manufacturing method of a three-dimensional structure according to claim
 1. 7. A three-dimensional structure which is manufactured by the manufacturing method of a three-dimensional structure according to claim
 2. 8. A three-dimensional structure which is manufactured by the manufacturing method of a three-dimensional structure according to claim
 3. 9. A three-dimensional structure which is manufactured by the manufacturing method of a three-dimensional structure according to claim
 4. 10. A three-dimensional structure which is manufactured by the manufacturing method of a three-dimensional structure according to claim
 5. 